王毅坚1,2, 薛蓄峰1, 梁勇1, 王文1, 朱宸晖3.差分负载式无线无源声表面波应变传感器研究[J].压电与声光,2018,40(3):374-378.WANG Yijian1,2, XUE Xufeng1, LIANG Yong1, WANG Wen1, ZHU Chenhui3.Research on Difference Load Type Surface Acoustic Wave Passive Wireless Strain Sensor[J].PIEZOELECTRICS AND ACOUSTOOPTICS
差分负载式无线无源声表面波应变传感器研究
Research on Difference Load Type Surface Acoustic Wave Passive Wireless Strain Sensor
  
DOI:10.11977/j.issn.1004-2474.2018.03.017
中文关键词:  声表面波(SAW)  应变传感器  负载传感器  无线无源
英文关键词:SAW  strain sensor  load sensor  wireless passive
基金项目:国家自然科学基金资助项目(11374254)
作者单位
王毅坚1,2, 薛蓄峰1, 梁勇1, 王文1, 朱宸晖3 (1. 中国科学院 声学研究所 超声技术中心北京 100190 2. 中国科学院大学 电子电气与通信工程学院北京 100049 3.电子科技大学 格拉斯哥学院四川 成都 610054) 
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中文摘要:
      在用声表面波(SAW)传感器直接测量应变时,易受到环境温度的干扰,将不可避免地产生力温耦合效应。针对该问题,该文提出了一种新型的外接应变传感器负载,并采用了差分结构的无线无源SAW应变传感器设计方法。传感器采用双通道SAW反射型延迟线作为无线传感系统的应答器,其中一个通道外接力容性应变片作为外接负载传感器以感知应变量,另外一个通道则外接参考负载以差分抵消测试环境温度变化的影响。该文结合耦合模理论,仿真了负载容性应变传感器电容变化引起的SAW传感系统响应特性。最后通过实验验证了这种差分负载式SAW应变传感器的可行性与有效性。
英文摘要:
      When using the surface acoustic wave (SAW) sensor to measure strain directly, which is vulnerable to ambient temperature interference, the sensor will inevitably produce force temperature coupling effect. Therefore, this paper presents a new type of wireless passive SAW strain sensor design method that is adopting an external load and differential structure. The SAW device in the sensor is used as a transponder for the wireless sensor system, which is adopting the dual channel reflective delay line differential structure. One of the channels, collecting an external capacitive strain gauges used as the external load sensor, senses the strain. And the other one, also collecting an external capacitive strain gauges used as an external reference load, is used to counteract the effects of temperature changes in the test environment. Based on the coupling of modes (COM) theory, this paper has simulated the load sensor capacitance changes caused by the sensor response characteristics. Finally, the feasibility and effectiveness of this differential load SAW strain sensor are verified by experiment.
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